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Related Concept Videos

Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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Updated: May 26, 2026

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

Defects That Magnetize Beyond Monolayer PtSe2.

Ilias M Oikonomou1,2,3, Danielle Douglas-Henry2,3, Mohammadreza Daqiqshirazi1,4

  • 1Faculty of Chemistry and Food Chemistry, Dresden University of Technology, Dresden, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|May 25, 2026
PubMed
Summary

Defect engineering in multilayer platinum diselenide (PtSe2) creates robust magnetism. Complex defects restore magnetism, enabling tunable 2D half-metallic states for spintronics.

Keywords:
PtSe2aberration‐corrected STEMdefectsdensity functional theorymagnetismmultilayertwo‐dimensional

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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

Published on: December 5, 2015

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Last Updated: May 26, 2026

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
08:12

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

Published on: December 5, 2015

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials offer potential for advanced spintronic and quantum devices.
  • Achieving magnetism beyond the monolayer in 2D materials is a significant challenge.

Purpose of the Study:

  • Investigate the emergence and control of magnetism in multilayer platinum diselenide (PtSe2).
  • Explore defect engineering strategies to realize tunable magnetic properties in PtSe2.

Main Methods:

  • Hybrid density functional theory (DFT) calculations.
  • Aberration-corrected scanning transmission electron microscopy (AC-STEM).

Main Results:

  • Magnetism in PtSe2 is typically quenched by interlayer interactions but restored by complex defects (Pt vacancy + PtSe antisite).
  • These defects induce magnetic moments up to 3.16 µB and create 2D half-metallic states in bilayer PtSe2.
  • Se vacancies tune magnetic properties and extend magnetic moments in trilayer PtSe2.

Conclusions:

  • Defect engineering provides a method for robust magnetic phase control in PtSe2 without external doping or strain.
  • PtSe2 serves as a tunable platform for room-temperature spintronic and valleytronic applications.